EXCLUSIVE: Terrorists are planning devastating attack as part of 'war in Britian'

ATTACK: MI5 believe terrorists are planning a high-profile assault like the one in Mumbai in 2008 [GETTY]

MI5 believes Brit terrorists returning home from fighting abroad are planning a “spectacular” similar to the Mumbai attack in India in 2008 which left 174 people dead and more than 300 injured.

Intelligence chiefs have learned the Islamic State (IS) terror group want to “bring the war to the UK” by launching commando attacks on high-profile buildings in either London, Birmingham or Manchester.

The Daily Star Sunday has also learned the SAS has moved part of its counter-terrorist team to a base near London following the raising of the terror threat from “substantial” to “severe”, meaning a terrorist attack in the UK is “highly likely”.

“The terrorists could storm a building, rig it with explosives, take hostages or kill at will”

Anonymous source

IS could be bringing explosives and weapons into the country via shipping containers, experts believe.

One source said: “The nightmare scenario is that IS will mount an attack at a high-profile location in the City of London or another major financial centre such as Canary Wharf.

“The terrorists could storm a building, rig it with explosives, take hostages or kill at will.

“It would be a suicide operation and there would be a lot of casualties.